Transistor circuit small signal analysis

Hi, I am trying to obtain the transfer function for the following circuit (from Vin signal source to voltage Vout), so I obtained the equivalent small singals circuit but I can't seems to isolate the gain in the transfer function, so I am wondering if my ss circuit is right.
Thanks for the help in advance. original circuit small signal

Doubt is in the ss circuit I have drawn, I'd like to know if I am getting it right. Don't want help finding the transfer function, I'm okay with that, I just need to know if the ss circuit is the right one, or it's pointless to go forth with the computation of the in/out function.